Ludvigsen's first book on the 550 Porsche Spyder was much better documented with the evolution of the 550 both historically & technically.
Lip service paid only to 550A with only a very few photos - none of car from the rear or cockpit/dash. No indication of number made etc. The Porsche Spyder RSK never showed "k" torsion bar front end, Never indicated how 718 differed from RSK, never indicated production numbers of the numerous variants with 4 cylinder & 8 cylinder. The whole book appeared to be hastily put together and really did not come close to his informative Porsche 550 Spyder Book in sum or substance and subsequently not worth the wait or the money.